Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1994-09-06
1996-12-24
Ricci, John A.
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
4052595, 4053022, E21D 2002
Patent
active
055868398
ABSTRACT:
A mine tunnel roof bolt is constructed of one or more multi-strand steel cables that form the bolt shaft, the end(s) of which are press-fitted into a sleeve that defines the bolt head. The bolt can be either active (post-installation tensionable) or passive (not post-installation tensionable). Each of the cable bolt shafts includes an enlarged section that is slightly larger than the diameter of the axial bore through the bolt head sleeve so that the cable enlarged section interferes with the bolt head sleeve. The bolt will withstand a predetermined maximum amount of tension load, after which it will yield. Yield is effected by the cable enlarged section's being pulled through the bolt head sleeve, the interference therebetween causing both the sleeve and cable enlarged section to deform. The bolt will maintain its maximum tension load until the cable enlarged section is pulled through the bolt head sleeve. The cable enlarged section is formed by the addition of a spacer sleeve around the cable center strand (king wire) and between the cable center strand and peripheral strands, or by the addition of a cable sleeve around the cable at the appropriate location. Either design will result in the cable enlarged section's having a greater outside diameter than the bolt head sleeve axial bore, to result in the interference as the cable enlarged section is pulled through the bolt head sleeve.
REFERENCES:
patent: 2850937 (1958-09-01), Ralston
patent: 4360292 (1982-11-01), Keeler et al.
patent: 4798501 (1989-01-01), Spies
patent: 5230589 (1993-07-01), Gillespie
patent: 5253960 (1993-10-01), Scott
patent: 5259703 (1993-11-01), Gillespie
patent: 5375946 (1994-12-01), Locotos
patent: 5417521 (1995-05-01), Scott
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